Add __nullptr as a C++0x nullptr literal, available in C++98

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@118482 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Basic/TokenKinds.def

@@ -358,6 +358,7 @@ ALIAS("__complex__"  , _Complex   , KEYALL)
 ALIAS("__imag__"     , __imag     , KEYALL)
 ALIAS("__inline"     , inline     , KEYALL)
 ALIAS("__inline__"   , inline     , KEYALL)
+ALIAS("__nullptr"    , nullptr      , KEYCXX)
 ALIAS("__real__"     , __real     , KEYALL)
 ALIAS("__restrict"   , restrict   , KEYALL)
 ALIAS("__restrict__" , restrict   , KEYALL)

test/SemaCXX/nullptr-98.cpp

@@ -0,0 +1,3 @@
+// RUN: %clang_cc1 -std=c++98 -fsyntax-only -verify %s
+void f(void *);
+void g() { f(__nullptr); }